brewcask-check-appcast

###########
# Checks if the given cask needs to be upgraded.
#
#!/bin/bash
set -o pipefail
source /etc/profile

if [ $# -eq 0 ]; then
    ARGS=($(brew cask list))
else
    ARGS=("$@")
fi

for _C in "${ARGS[@]}"; do
	[ "$(brew cask _appcast_checkpoint --calculate ${_C} 2>&1)" == "$(brew cask _appcast_checkpoint ${_C} 2>&1)" ] || {
		echo "Cask: ${_C} needs to be updated"
	}
	shift
done